Ercist 4 . 0 secure operating system uses a new model of securiy policy , which combines rbac , dte and mac together and makes access control more flexible . we introduce the design and implementation of identification and authentication mechanism and access control mechanism in this thesis 安胜4 . 0安全操作系统采用新的安全策略模型，将rbac 、 dte和mac三种访问控制机制结合在一起，使访问控制更加灵活，本文对系统中标识与鉴别机制和访问控制机制的设计和实现进行了介绍。
The architecture of grid file system services specification spells out the hierarchical structure to facilitate federation and sharing of virtualized data from file systems in the grid environment by providing the virtual namespace that will allow association of access control mechanisms and metadata of the underlying physical data sources Architecture of grid file system services规范通过提供虚拟命名空间来制订层次结构（这样可以在访问控制机制和底层物理数据源的元数据之间建立关联） ，从而促进网格环境中文件系统中虚拟数据的联邦和共享。
